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  1. #include<stdio.h>
  2. #include<math.h>
  3. int main(){
  4. 	long long n;
  5. 	int x=pow(10,9)+7;
  6. 	scanf("%lld",&n);
  7. 	long long a=(n+1)*(n+2)/2;
  8. 	long long b = a%x;
  9. 	printf("%lld",b);
  10. }
Success #stdin #stdout 0s 5512KB
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https://ideone.com/3n5fAS
language:
C (gcc 8.3)
created:
2 years ago
visibility:
secret

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